Edited by Mark Randall, with contributing articles by some of the worlds most prominent Hoya Gurus, it was super informative, full of amazing photos and well constructed.
It will be missed. I've received Mark's permission to upload the files to the Hoya Cubit for preservation's sake.

This fussy member of the Milkweed family has been giving gray hairs to growers for decades. One of the most important factors in successfully growing these plants is the soil, and there are as many soil mixes used for Hoya as there are Hoya themselves!